How to change duration of ImageView in Objective-C

I am creating a simple camera app for a photobooth. This code below is a sample of the whole project, I am using AVFoundation because I needed my own custom requirements.

When the user presses a button, it takes a photo and instantly shows the preview in the imageView. This is my first major coding project and am new to Objective-C. Is there a way to add a timer or duration to the imageView so that it then removes the image from it, or a way to cycle to a second black image after some time, ready for the next user to take their photo?

Many thanks for any help suggested!

- (IBAction)takephoto:(id)sender {

    AVCaptureConnection *videoConnection = nil;

    for (AVCaptureConnection *connection in StillImageOutput.connections) {
        for (AVCaptureInputPort *port in [connection inputPorts ]) {
            if ([[port mediaType] isEqual:AVMediaTypeVideo]) {
                videoConnection = connection;
                break;
            }
        }
    }
    [StillImageOutput captureStillImageAsynchronouslyFromConnection:videoConnection completionHandler:^(CMSampleBufferRef imageDataSampleBuffer, NSError *error) {
        if (imageDataSampleBuffer != NULL) {
            NSData *imageData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageDataSampleBuffer];
            UIImage *image = [UIImage imageWithData:imageData];
            imageView.image = image;
        }
    }];
}